94 f150 4x4 supercab 5.0l 5 speed manual.check engine light flashing, we wee told its egr code. we pulled valve off last night, some crud in manifold but not plugged, the plunger moves freely, so what actually goes bad the little electrical solenoid on top of the valve or is the issue somewhere else. the electrical plug looked ok

 

Hey I am from the 48-60 forums. Was bored tonight so I thought I would have a look at some other forums.Anyway on your egr system you have the valve, solenoid,lines and postion sensor on top of the valve.There is vacumn on one of the lines to the soleniod all the time.Make sure its there when engine is running. The other one goes to the valve.On top of the solenoid there is a cap type top on it. Take this off, it may take a little twisting.There will be a piece of foam in there. Carefully remove foam. With engine running there should be vacumn at this little tower looking thing that the foam was on.If there is no vacumn check for a broken line. If there is vacumn there plug the top with your finger. This will direct the vacumn to the valve and pull it open and cause the engine to stall.If engine stalls this means valve is good and working.If engine doesnt stall valve did not open or the ports inside are plugged.So if the engine stalled we proved the vacumn supply was good and the valve and passages are ok. So the only thing left is the soleniod or the position sensor on top of the valve or the wiring to soleniod or computor( never seen a bad computor driver for the egr)More then likly its the soleniod.Can unplug it and with engine running hook a 9v battery to it. It sould click on and engine should stall again.Solenoid 80% of the time is the proplem Sensor on valve 20% . You can check it aswell but you need a DVOM.Hope this helps.

 

thank you thats exactly what i wanted to know. on this truck it seems like the solenoid and the position sensor are all one unit. there is one, threee wire plug, and only 1 electrical component on top of the actual valve. does that sound possible. any way to tell which 2 wires would be the solenoid

 

The wires do not go to the solenoid, that's the position sensor feeding the computer. The vacuum line attached to the body of the valve goes back to the EVR(EGR Vacuum Regulator) which is over by the coil on a bracket with a couple other solenoids.

 

thanks conanski thats kind of what i was wondering whether there was egr components hidden other places on the truck. that should fix me up i'm thinking